Chevrolet Silverado 2007 Owner's Manual page 302

LOUD: The chime volume will be set to a
loud level.
NO CHANGE: No change will be made to this
feature. The current setting will remain.
Choose one of the available settings and press
the set/reset button while it is displayed on the DIC
to select it.
PARK TILT MIRRORS
If your vehicle has this feature, it allows you to
select whether or not the outside mirror(s)
will automatically tilt down when the vehicle is
shifted into REVERSE (R). See Outside Power
Foldaway Mirrors on page 182 for more
information.
Press the customization button until PARK TILT
MIRRORS appears on the DIC display. Press the
set/reset button once to access the settings for
this feature. Then press the customization button
to scroll through the following settings:
OFF (default): Neither outside mirror will be tilted
down when the vehicle is shifted into
REVERSE (R).
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DRIVER MIRROR: The driver's outside mirror will
be tilted down when the vehicle is shifted into
REVERSE (R).
PASSENGER MIRROR: The passenger's outside
mirror will be tilted down when the vehicle is
shifted into REVERSE (R).
BOTH MIRRORS: The driver's and passenger's
outside mirrors will be tilted down when the vehicle
is shifted into REVERSE (R).
NO CHANGE: No change will be made to this
feature. The current setting will remain.
Choose one of the available settings and press
the set/reset button while it is displayed on the DIC
to select it.